could switch
Regular verb: switch - switched- switched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could switch
you could switch
he could switch
we could switch
you could switch
they could switch 	I could be switching
you could be switching
he could be switching
we could be switching
you could be switching
they could be switching	I could have switched
you could have switched
he could have switched
we could have switched
you could have switched
they could have switched	I could have been switching
you could have been switching
he could have been switching
we could have been switching
you could have been switching
they could have been switching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't switch
you couldn't switch
he couldn't switch
we couldn't switch
you couldn't switch
they couldn't switch 	I couldn't be switching
you couldn't be switching
he couldn't be switching
we couldn't be switching
you couldn't be switching
they couldn't be switching	I couldn't have switched
you couldn't have switched
he couldn't have switched
we couldn't have switched
you couldn't have switched
they couldn't have switched	I couldn't have been switching
you couldn't have been switching
he couldn't have been switching
we couldn't have been switching
you couldn't have been switching
they couldn't have been switching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I switch?
could you switch?
could he switch?
could we switch?
could you switch?
could they switch? 	could I be switching?
could you be switching?
could he be switching?
could we be switching?
could you be switching?
could they be switching? 	could I have switched?
could you have switched?
could he have switched?
could we have switched?
could you have switched?
could they have switched? 	could I have been switching?
could you have been switching?
could he have been switching?
could we have been switching?
could you have been switching?
could they have been switching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I switch?
couldn't you switch?
couldn't he switch?
couldn't we switch?
couldn't you switch?
couldn't they switch? 	couldn't I be switching?
couldn't you be switching?
couldn't he be switching?
couldn't we be switching?
couldn't you be switching?
couldn't they be switching? 	couldn't I have switched?
couldn't you have switched?
couldn't he have switched?
couldn't we have switched?
couldn't you have switched?
couldn't they have switched? 	couldn't I have been switching?
couldn't you have been switching?
couldn't he have been switching?
couldn't we have been switching?
couldn't you have been switching?
couldn't they have been switching?